linux-kernel - Re: [PATCH v2 4/7] arm64: dts: qcom: Add msm8939 SoC

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Message-ID: <547ef944-be4d-365e-c639-91812286e42a@linaro.org>
Date:   Wed, 11 Jan 2023 10:12:25 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...aro.org, djakov@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        benl@...areup.com, shawn.guo@...aro.org, fabien.parent@...aro.org,
        leo.yan@...aro.org, dmitry.baryshkov@...aro.org,
        Jun Nie <jun.nie@...aro.org>,
        James Willcox <jwillcox@...areup.com>,
        Joseph Gates <jgates@...areup.com>,
        Max Chen <mchen@...areup.com>, Zac Crosby <zac@...areup.com>,
        Vincent Knecht <vincent.knecht@...loo.org>,
        Stephan Gerhold <stephan@...hold.net>
Subject: Re: [PATCH v2 4/7] arm64: dts: qcom: Add msm8939 SoC

On 10/01/2023 14:42, Bryan O'Donoghue wrote:
> On 10/01/2023 13:24, Krzysztof Kozlowski wrote:
>> On 10/01/2023 14:14, Bryan O'Donoghue wrote:
>>> On 03/01/2023 09:14, Krzysztof Kozlowski wrote:
>>>> ../arch/arm64/boot/dts/qcom/msm8939.dtsi:1825.23-1842.5: Warning
>>>> (simple_bus_reg): /soc@...mc@...4000: simple-bus unit address format
>>>> error, expected "7824900
>>>
>>> For the record the driver consuming this dt entry requires the host regs
>>> to come first followed by the core
>>>
>>> sdhc_1: mmc@...4000 {
>>>           compatible = "qcom,msm8916-sdhci", "qcom,sdhci-msm-v4";
>>>           reg = <0x07824900 0x11c>, <0x07824000 0x800>;
>>>           reg-names = "hc", "core";
>>> }
>>>
>>> If I change this and the msm8916 to
>>
>> That's not the solution. The warning is saying that unit address does
>> not match your reg. You need to correct unit address.
>>
>> Best regards,
>> Krzysztof
>>
> 
> Is it not the case that the unit-address should match the first reg and 

As Konrad wrote, yes.

> that the first reg should also be the lowest address ?

I never heard such requirement, although it would be logical choice. In
this case your solution is to use the higher address as unit address.
apq8084, msm8226 and maybe more already do it.

You can also look at this that HC was made as the main IO address of a
device (if one can call something "main" here), thus it should be
expressed in unit address.

Best regards,
Krzysztof